linux-kernel - Re: WARNING: at drivers/gpu/drm/ttm/ttm_page

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Date:	Wed, 06 Apr 2011 11:13:59 +0200
From:	Thomas Hellstrom <thomas@...pmail.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dave Airlie <airlied@...hat.com>
CC:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: WARNING: at drivers/gpu/drm/ttm/ttm_page_alloc.c:758

Dave, Konrad

I think we need to back out this change as soon as possible. I will 
follow up the discussion with Konrad on how we should attempt to handle 
vm passthrough as soon as things settle down a bit over here. Hopefully 
this week.

Thomas



On 04/06/2011 10:54 AM, Markus Trippelsdorf wrote:
> On 2011.04.05 at 18:31 +0200, Markus Trippelsdorf wrote:
>    
>> On 2011.03.29 at 16:56 +0200, Markus Trippelsdorf wrote:
>>      
>>> Just came across this WARNING (running latest git kernel):
>>>
>>> Mar 29 09:14:39 gentoo kernel: udev[888]: starting version 164
>>> Mar 29 15:45:45 gentoo kernel: ------------[ cut here ]------------
>>> Mar 29 15:45:45 gentoo kernel: WARNING: at drivers/gpu/drm/ttm/ttm_page_alloc.c:758 ttm_put_pages+0x1c6/0x2b0()
>>> Mar 29 15:45:45 gentoo kernel: Hardware name: System Product Name
>>>        
>> It happened again today.
>>
>>   ------------[ cut here ]------------
>>   WARNING: at drivers/gpu/drm/ttm/ttm_page_alloc.c:758 ttm_put_pages+0x1c6/0x2c0()
>>   Hardware name: System Product Name
>>   Pid: 680, comm: kworker/u:6 Not tainted 2.6.39-rc1-00254-gd297f96 #5
>>   Call Trace:
>>   [<ffffffff810736af>] warn_slowpath_common+0x6f/0xa0
>>   [<ffffffff810737fa>] warn_slowpath_null+0x1a/0x20
>>   [<ffffffff812c7726>] ttm_put_pages+0x1c6/0x2c0
>>   [<ffffffff812bff7d>] ttm_tt_free_alloced_pages+0xbd/0x100
>>   [<ffffffff812c0a5c>] ttm_tt_swapout+0x1bc/0x2c0
>>   [<ffffffff812c2365>] ttm_bo_swapout+0x1a5/0x240
>>   [<ffffffff812b5637>] ? drm_mm_kmalloc+0x37/0xe0
>>   [<ffffffff812bf3b8>] ttm_shrink+0xd8/0x140
>>   [<ffffffff8108eb01>] ? queue_work+0x21/0x60
>>   [<ffffffff812bf420>] ? ttm_shrink+0x140/0x140
>>   [<ffffffff812bf439>] ttm_shrink_work+0x19/0x20
>>   [<ffffffff8108dade>] process_one_work+0x11e/0x4e0
>>   [<ffffffff8108e4ce>] worker_thread+0x16e/0x360
>>   [<ffffffff8108e360>] ? manage_workers.isra.28+0x260/0x260
>>   [<ffffffff810932ac>] kthread+0x8c/0xa0
>>   [<ffffffff8152a394>] kernel_thread_helper+0x4/0x10
>>   [<ffffffff81093220>] ? kthread_flush_work_fn+0x20/0x20
>>   [<ffffffff8152a390>] ? gs_change+0xb/0xb
>>   ---[ end trace cb7fc1aad109a0a7 ]---
>>   ------------[ cut here ]------------
>>      
> Looks like this is caused by f9820a46dd7888b05a36e81166fb1abcc47dcc3f :
>
>   ttm: Utilize the DMA API for pages that have TTM_PAGE_FLAG_DMA32 set.
>
> CCing the relevant people.
>
>    

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